NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes, Hydraulic complaints
33 reportsClear category filter56,000 miles · Feb 6, 2012
Service Brakes, HydraulicStructure
HAD MULTIPLE BRAKE LINE FAILURES IN THE LAST 2 MONTHS. FIRST BEING THE MAIN LINE TO THE REAR BRAKES, THEN BRAKE LINE TO THE RIGHT FRONT WHEEL, THEN LINE TO LEFT FRONT WHEEL. WHILE TRUCK WAS BEING WORKED ON IT WAS NOTICED THAT THE FRONT FRAME RAIL WAS STARTING TO RUST THROUGH NEAR WHERE THE FRONT BUMPER MOUNTS, ALSO NOTICED RUST…
Read full complaint
HAD MULTIPLE BRAKE LINE FAILURES IN THE LAST 2 MONTHS. FIRST BEING THE MAIN LINE TO THE REAR BRAKES, THEN BRAKE LINE TO THE RIGHT FRONT WHEEL, THEN LINE TO LEFT FRONT WHEEL. WHILE TRUCK WAS BEING WORKED ON IT WAS NOTICED THAT THE FRONT FRAME RAIL WAS STARTING TO RUST THROUGH NEAR WHERE THE FRONT BUMPER MOUNTS, ALSO NOTICED RUST ON THE FRAME AT FRONT OF CAB AREA, THIS IS NOT SURFACE RUST, THIS IS RUSTED THROUGH THE FRAME AND HAS LARGE RUST SCALES. IT IS PRIMARILY IN THE AREA OF THE CAB AND FORWARD. FRAME SEEMS TO BE OKAY FROM THE CAB BACK, PROBLEM IS WHERE THE FRAME IS ENCLOSED. *TR
NHTSA ODI #10446888
145,000 miles · Oct 9, 2011
Service Brakes, HydraulicCrashInjury
TIME 15:30. ROAD CONDITIONS: DRY. NO CLOUDS. INCIDENT: SLOWING TO A STOP AT PEDESTRIAN CROSSING, THE ABS SYSTEM ACTIVATED AT APPROXIMATELY 8 MPH. VEHICLE FAILED TO STOP AND LURCHED FORWARD INTO PEDESTRIANS. CONDITION REPLICATES THE ABS FAILURES IN SIMILAR VEHICLES THAT ARE UNDER RECALL; DEALER INDICATED THIS VEHICLE WAS NOT PAR…
Read full complaint
TIME 15:30. ROAD CONDITIONS: DRY. NO CLOUDS. INCIDENT: SLOWING TO A STOP AT PEDESTRIAN CROSSING, THE ABS SYSTEM ACTIVATED AT APPROXIMATELY 8 MPH. VEHICLE FAILED TO STOP AND LURCHED FORWARD INTO PEDESTRIANS. CONDITION REPLICATES THE ABS FAILURES IN SIMILAR VEHICLES THAT ARE UNDER RECALL; DEALER INDICATED THIS VEHICLE WAS NOT PART OF RECALL BUT HAS SAME ISSUE. *TR
NHTSA ODI #10429258
90,000 miles · Sep 22, 2011
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2000 CHEVROLET K3500. THE CONTACT STATED WHILE DRIVING 10 MPH, HE APPLIED THE BRAKES AND THE ANTI LOCK BRAKES ENGAGED. THE VEHICLE WAS NOT TAKEN TO DEALER TO HAVE THE FAILURE DIAGNOSED OR REPAIRED. AN AUTHORIZED DEALER WAS NOTIFIED AND THE CONTACT WAS INFORMED THAT THE VEHICLE WAS NOT INCLUDED IN THE RECAL…
Read full complaint
TL* THE CONTACT OWNS A 2000 CHEVROLET K3500. THE CONTACT STATED WHILE DRIVING 10 MPH, HE APPLIED THE BRAKES AND THE ANTI LOCK BRAKES ENGAGED. THE VEHICLE WAS NOT TAKEN TO DEALER TO HAVE THE FAILURE DIAGNOSED OR REPAIRED. AN AUTHORIZED DEALER WAS NOTIFIED AND THE CONTACT WAS INFORMED THAT THE VEHICLE WAS NOT INCLUDED IN THE RECALL ASSOCIATED WITH NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC:ANTILOCK). THE FAILURE MILEAGE WAS 90,000.
NHTSA ODI #10426774
135,000 miles · Jul 27, 2010
Service Brakes, HydraulicCrash
TL* THE CONTACT OWNS A 2000 CHEVROLET C3500. THE CONTACT STATED WHILE BRAKING FROM APPROXIMATELY 35 MPH, THE BRAKES DID NOT ENGAGE AND THE CONTACT PROCEEDED TO CRASH INTO THE REAR OF ANOTHER VEHICLE. THE AIR BAGS DID NOT DEPLOY. THERE WERE NO INJURIES. THE VEHICLE WAS TOWED TO A LOCAL REPAIR FACILITY WHERE THE MECHANIC ADVISED …
Read full complaint
TL* THE CONTACT OWNS A 2000 CHEVROLET C3500. THE CONTACT STATED WHILE BRAKING FROM APPROXIMATELY 35 MPH, THE BRAKES DID NOT ENGAGE AND THE CONTACT PROCEEDED TO CRASH INTO THE REAR OF ANOTHER VEHICLE. THE AIR BAGS DID NOT DEPLOY. THERE WERE NO INJURIES. THE VEHICLE WAS TOWED TO A LOCAL REPAIR FACILITY WHERE THE MECHANIC ADVISED THAT THE BRAKE LINES WERE RUSTED AND CORRODED. ONE OF THE BRAKE LINES HAD FRACTURED AT THE REAR DRIVER SIDE WHEEL. THE MANUFACTURER WOULD NOT PROVIDE ANY ASSISTANCE. THE VEHICLE WAS LEFT AT THE REPAIR FACILITY WHERE THE CONTACT WAS AWAITING REPAIRS. THE FAILURE AND CURRENT MILEAGES WERE APPROXIMATELY 135,000.
NHTSA ODI #10345628
58,000 miles · Feb 17, 2009
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 CHEVROLET K3500. WHILE DRIVING APPROXIMATELY 30 MPH, THE ABS ACTIVATED AND CAUSED THE VEHICLE TO CONTINUE MOVING WHEN THE BRAKE PEDAL WAS DEPRESSED. THE MANUFACTURER STATED THAT HIS VIN WAS NOT INCLUDED IN NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC: ANTI LOCK). THE VEHICLE HAS NOT…
Read full complaint
TL*THE CONTACT OWNS A 2000 CHEVROLET K3500. WHILE DRIVING APPROXIMATELY 30 MPH, THE ABS ACTIVATED AND CAUSED THE VEHICLE TO CONTINUE MOVING WHEN THE BRAKE PEDAL WAS DEPRESSED. THE MANUFACTURER STATED THAT HIS VIN WAS NOT INCLUDED IN NHTSA CAMPAIGN ID NUMBER 05V379000 (SERVICE BRAKES, HYDRAULIC: ANTI LOCK). THE VEHICLE HAS NOT BEEN REPAIRED. THE FAILURE AND CURRENT MILEAGES WERE 58,000. UPDATED 03/12/09. *LJ UPDATED 03/13/09. *JB
NHTSA ODI #10259133
1,923 miles · Dec 6, 2005
Service Brakes, Hydraulic
THIS INFORMATION PERTAINS TO A CHEVY CK 3500 CREW CAB 4X4 DULLY PURCHASED NEW IN 2000. AT 1,923 MILES THE ORIGINAL FACTORY FRONT BRAKE PADS WERE WORN OUT AND REPLACED UNDER WARRANTY. AT 3,108 MILES THE ROTOR ASSEMBLY WAS REPLACED. AGAIN, AT 7,709 MILES THE FRONT DISC PADS HAD TO BE REPLACED. AT 11,596 MILES FRONT DISC PADS, …
Read full complaint
THIS INFORMATION PERTAINS TO A CHEVY CK 3500 CREW CAB 4X4 DULLY PURCHASED NEW IN 2000. AT 1,923 MILES THE ORIGINAL FACTORY FRONT BRAKE PADS WERE WORN OUT AND REPLACED UNDER WARRANTY. AT 3,108 MILES THE ROTOR ASSEMBLY WAS REPLACED. AGAIN, AT 7,709 MILES THE FRONT DISC PADS HAD TO BE REPLACED. AT 11,596 MILES FRONT DISC PADS, REAR SHOES AND LININGS. AT 20,317 MILES FRONT PADS AGAIN ALONG WITH REPLACEMENT OF H1320 BOOSTER ASSEMBLY. AT 24,977 MILES FRONT PADS AND H0780 BRAKE VALVE REPLACED. AT 35,000 MILES ONE MORE SET OF FRONT DISC BRAKE PADS BEFORE THE WARRANTY RAN OUT AND THE GENERAL CUT ME LOOSE. SINCE THE WARRANTY EXPIRED, IT HAS CONTINUED TO BE A FRONT BRAKE JOB BETWEEN EVERY 6,000-10,000 MILES. *NM
NHTSA ODI #10144618
75,500 miles · Nov 18, 2005
Service Brakes, Hydraulic
ANTILOCK BRAKES ALWAYS ACTIVATE WHEN BRAKING AT SLOW SPEEDS, WAS TOLD BY CHEVY DEALER THERE IS A RECALL BUT NOT ON MY VEHICLE. *NM
NHTSA ODI #10143082
67,700 miles · Jun 1, 2005
Service Brakes, Hydraulic
DT: PROBLEMS BEGAN ABOUT MARCH 2005, WITH ANTI LOCK BRAKE SYSTEM. FRONT BRAKES ARE GRABBING, AND CALIPERS STAY SHUT. WHEN DRIVER HITS THE BRAKES HARD CALIPERS LOCK. AND WHEN MAKING TURNS A NOISE IS HEARD, A GRINDING NOISE. IN LAST 4 MONTHS BRAKES WERE REPLACED TWICE. EXTENDED STOPPING DISTANCE IS CAUSED WHEN THIS OCCURS. NO W…
Read full complaint
DT: PROBLEMS BEGAN ABOUT MARCH 2005, WITH ANTI LOCK BRAKE SYSTEM. FRONT BRAKES ARE GRABBING, AND CALIPERS STAY SHUT. WHEN DRIVER HITS THE BRAKES HARD CALIPERS LOCK. AND WHEN MAKING TURNS A NOISE IS HEARD, A GRINDING NOISE. IN LAST 4 MONTHS BRAKES WERE REPLACED TWICE. EXTENDED STOPPING DISTANCE IS CAUSED WHEN THIS OCCURS. NO WARNING LIGHTS COME ON, AFTER REMOVAL,THE PADS WERE CHEWED UP. NOT WORN, BUT DAMAGED. OWNER REPLACED BRAKES. *AK
NHTSA ODI #10123752
5,300 miles · May 3, 2005
Service Brakes, Hydraulic
SAME SYMTOMS AS DESCRIBED IN ACTION # PE05020 ABS SYSTEM ENGAGES WHEN APPLYING BRAKES AT SLOW SPEED, SUDDENLY THEIR IS MINIMUM BRAKING, AND STOPPING DISTANCE IS INCREASED GREATLY! VEHICLE IS OUT OF WARRANTY AND DEALER SAYS SYSTEM NEEDS TO BE "FIXED".
NHTSA ODI #10119535
Mileage unknown · Dec 27, 2004
Service Brakes, Hydraulic
THE ABS CHECK LIGHT MAINTAINS ON WHILE THE VEHICLE IS HAVING A DIFFICULT TIME STOPPING AT INCLINES AND INTERSECTIONS. CONSUMER WILL CONTACT DEALER FOR CHECK UP.*AK VEHICLE ROCKS THROUGH STOPS IN WET CONDITIONS WITH ABS NOISES, BUT VEHICLE DOES NOT STOP. *AK
NHTSA ODI #10105307
NHTSA investigations
2EA04012 · Hydraulic Pump Failres
Opened Apr 30, 2004 · Closed Feb 28, 2005
Status: closed (inferred from source dates) · Service Brakes, Hydraulic:power Assist; Steering:hydraulic Power Assist System
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
Additional source detail variants (2)
Service Brakes, Hydraulic:power Assist
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
Steering:hydraulic Power Assist System
GM IS CONDUCTING A RECALL ON ALL SUBJECT VEHICLES BUILD BETWEEN MAY 1999 AND OCTOBER 14, 1999.SIGNIFICANT CHANGES WERE INCORPORATED INTO PRODUCTION IN EARLY OCTOBER 1999, AND VEHICLES BUILT AFTER THAT DATE HAVE LOWER WARRANTY FAILURE RATES.THE COMPLAINT AND WARRANTY DATA APPEAR TO SUPPORT THE EFFECTIVENESS OF THESE CHANGES. GM MADE ADDITIONAL CHANGES IN NOVEMBER 1999, FEBRUARY 2000, MAY 2001, AND FEBRUARY 2004.ODI WILL CONTINUE TO MONITOR THIS PROBLEM AND WILL TAKE FURTHER ACTION, IF WARRANTED, IN THE FUTURE.FOR FURTHER TECHNICAL DETAILS SEE THE ATTACHED ENGINEERING ANALYSIS REPORT.
PE04004 · Hydraulic Pump Shaft Failures
Opened Jan 8, 2004 · Closed Apr 30, 2004
Status: closed (inferred from source dates) · Service Brakes, Hydraulic; Service Brakes, Hydraulic:power Assist; Service Brakes, Hydraulic:power Assist:hydraulic; Steering:hydraulic Power Assist System; Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Additional source detail variants (5)
Service Brakes, Hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Service Brakes, Hydraulic:power Assist:hydraulic
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist:pump
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Steering:hydraulic Power Assist System
THE PRELIMINARY EVAULATION IS BEING UPGRADED.DURING THE EA ODI WILL LIMITITS INVESTIGATION TO ONLY THOSE VEHICLES EQUIPPED WITH A HYDRO-BOOST SYSTEM, WHICH PROVIDES POWER ASSIST TO THE BRAKING AND STEERING SYTEMS.VACCUUM BRAKE BOOSTER VEHICLES ARE EXCLUDED.ODI HASEXPANDED THE SCOPE OF THE EA TO INCLUDE MODEL YEARS2003 AND 2004, ASDURING THE PE, ODI LEARNED THAT THE HYDROBOAST PUMPS WERE MODIFIED IN FEBRAURY 2004.THEREFORE,ODI HAS EXPANDED THE SCOPE TO INCLUDE THE ADDITIONAL MODEL YEARS.ODI'S IS CONCERNED BECAUSE THISISA SUDDEN FAILURE THAT AFFECTS TWO CRITICAL SYSTEMS OF THE VEHICLE, BRAKES AND STEERING, AT THE SAME TIME.THE ABILITY OF THE OPERATOR TO HANDLE THE DUAL FAILURES IS A CONCERN. FURTHER, THESE VEHICLES TEND TO BE WORK VEHICLES, WITH SOME OVER 10,000 POUNDS GVWR AND MANY EQUIPPED TO PULL LARGE TRAILERS.DUAL FAILURES OF HEAVILY LOADED VEHICLES AND VEHICLES PULLING TRAILERS FURTHER INCREASES THE SAFETY RISK.ODI PLANS TO CONDUCT TESTING TO QUANTIFY THE BRAKING AND STEERING PERFORMANCE DEGRADATION AND THE IMPACT ON SAFE VEHICLE CONTROL, WHEN A HYDROBOAST PUMP FAILS.
Illustration